A toughening method of the interface in double-ceramic-layer thermal barrier coating based on selected laser modification

Gao Lei; Li Huiyun

doi:10.3788/IRLA202049.0105005

In this study an innovative peg-nail structured laser modification was carried out double-ceramic-layer thermal barrier coating (DCL-TBCs) by a pulsed Nd:YAG laser which were fabricated by a NiCoCrAlYTa bond coat and two ceramic top coat (YSZ and La₂Ce₂O₇, LC) sprayed by air plasma spraying. Results indicate that the roughness of the laser modified surface has significantly improved, compared with as-sprayed coatings. The completely recrystallization can be found in the peg-nail structured laser modified unit, including a fully dense columnar microstructure. Due to the peg-nail structured laser modification which generated re-melting and resolidificating at the whole LC coat and partial YSZ coat, can greatly improve the interface bonding property and the bonding strength, the peg-nail structured laser modified samples have better spallation or delamination resistance than the normal as-sprayed DCL-TBCs.

A toughening method of the interface in double-ceramic-layer thermal barrier coating based on selected laser modification

1. General Standard(Beijing) Institute of Science and Technology, Beijing 100070, China;

2. Shaanxi Preschool Normal University, Xi'an 710100, China

Received Date: 2019-10-11

Rev Recd Date: 2019-11-21

Publish Date: 2020-01-28

Key words:

Abstract: In this study an innovative peg-nail structured laser modification was carried out double-ceramic-layer thermal barrier coating (DCL-TBCs) by a pulsed Nd:YAG laser which were fabricated by a NiCoCrAlYTa bond coat and two ceramic top coat (YSZ and La₂Ce₂O₇, LC) sprayed by air plasma spraying. Results indicate that the roughness of the laser modified surface has significantly improved, compared with as-sprayed coatings. The completely recrystallization can be found in the peg-nail structured laser modified unit, including a fully dense columnar microstructure. Due to the peg-nail structured laser modification which generated re-melting and resolidificating at the whole LC coat and partial YSZ coat, can greatly improve the interface bonding property and the bonding strength, the peg-nail structured laser modified samples have better spallation or delamination resistance than the normal as-sprayed DCL-TBCs.

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Reference (18)

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A toughening method of the interface in double-ceramic-layer thermal barrier coating based on selected laser modification

doi: 10.3788/IRLA202049.0105005

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